Telephone system



F. A. L-UNDQUIST. TELEPHONE SYSTEM. APPLICATION FILED DEC.,2. I9I6'.

1 ,307, 688, Y Patented J 1111-9 24, 1919 Myer; fox g mh/r' 'AILumquiaf,

UNITED 'STTE ATENT OFFIC.

FRANK A. LUNDQUIST. OF NEW YORK, N. Y'.. ASSIGNOR TO WESTERN ELECTRICCOMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEIHONE SYSTEM.

Application filed December 2. 1916.

To r17! whom it may concern:

lie it known that l] FRANK A. Ltxnor is'r, a citizen of the l'nitedStates. residing at New York; in the county of New York and State of NewYork, have invented certain new and useful Improvements in 'l elcphoi'ieSystems, of which the following is a full, clear. concise. and exactdescription.

This invention relates to telephone systems, and more particularly toautomatic switches employed in such systems.

The object of this invention is the provisionofa new and improvedautomatic switch of increased capacity which may bedireetively'controlled by series of impulses.

The main feature of this invention is the provision of a selectiveswitch having a plurality of sets of terminals and a plurality of setsof brushes arranged to be directively moved into engagement with certainsets of terminals under the control of an impulse transmitter, and meansoperated under the Control of the impulse transmitter irrespective ofthe number of impulses transmitted for selecting the set of brushes tobe used.

Although the principles of the invention are herein shown applied to avconnector switch, they may with the usual modification, heapplied to aselector switch.

The invention is illustrated in the accompanying drawing in which Figure1 shows a side elevation of a connector switch, and a circuitarrangement by which the switch may be controlled and Fig. 2 shows aperspective view of the operating parts of a sender for controlling theoperation of the switch.

The switch herein disclosed is arranged to have ten vertical or groupselecting positiens and ten rotary or line selecting posi tions.

A and B designate two banks of contacts or terminals of 100 lines each.with which two sets of brushes a and 7) cooperate. The b1llSl1GS"(lnormally rest two steps below the first group of terminals in the bankA, while it is necessary to raise the switch one step to bring thebrushes 7) opposite the first group of terminals in the bank 13.

The brush set a mounted above the brush set 71 on a brush shaft (3,which shaft is supported for vertical and rotary movcmnt in a frame (notshown). A rotary ratchet T and a vertical ratchet S are provided on thebrush shaft with which Specification of Letters Patent.

Patented June 241, 1919.

Serial No. 134,571.

pawls carried by th* armatures of the rotary n'iagnrt RM and thevertical magnet YM respectively engage to operate shaft (3. A collar 10provided with a rod 9 is rota tably mounted near the bottom of the shaft(3 but is held against vertical movement on the shaft in any suitablemanner. This rod 9. near its lower portion carries a heel 11 whichfunctions in a manner to be described. A bell-erank leve 13 pivoted tothe frame has at the end of one. of its arms. a rounded portion 12 whichengages the heel 11 when the shaft 6 has been moved up one step. Theengagement of the rounded portion 12 and heel 11 causes the elevation ofthe arm 1% of said lever. A rod 15 pivoted to the upper end of thearmature of a magnet 5 normally rests on the arm 1a of the bellcranklever 13.

A side switch 31 provided with a Contact arm and contacts of usualstructure and arrangement. is actuated by a spring 32 to move in acounter-cloekwise direction under the control of an escapement 17. A rod16 pivoted to the upper end of this escapement member 17, will beengaged by the rod 15 upon the energization of magnet 5 at all timesafter the second vertical step of the shaft 6. The side switch 31 willbe advanced one position each time that the rod 16 is returned to itsnormal position by the action of the spring 33 after it has beenactuated to the right by the rod 15.

A dash pot 20 mounted on the frame is provided with a plunger arm 19.This plunger arm 19 carries lugs 18 and 22 and insulated arms 25 and 2G,and terminates at its left end in transverse roller 21. W'hen the shaft(5 has been raised one step and the magnet 5 is energized, the rod 15which now presses against the rod 18 will move the plunger arm 19 to theright. If the shaft 6 is now raised a second step, the rod 9 will engagethe roller 21 to hold the pluiiger arm in its oif-normal positionagainst the action of spring 24. until the switch is restored to normal.Ii. however, the magnet 5 is not,

energized after the shaft 6 has taken its first vertical step. the rod 9after the second vertical step )vill engage the roller 21 in such a wayas to hold the plunger arm 19 in normal position until the switch isrestored. The rod 9 is held by guides (not shown) so as to travelvertically with the shaft 6 but not to rotate with said shaft.

cuit from magnet. 5 to contact springs t0 when arm 19 is in any positionbut normal. The arms 25 and 26 on the arm 19 engage the contact springs27 and 28 when said arm is in normal position, and engage Contact.springs 29 and 30 when the arm 19 is moved to the right.

The vertical and rotary ratchets 7 and 8 are held by pawls 36 and 37,respectively,

which are pivoted on the frame. These pawls are spring-actuated andengage the ratchets whenever plunger arm of a dash pot 3+ is held inoff-normal position. This dash pot 3+ is mounted on the frame and itsarm 35 is normally held in engagement with the above mentioned pawls byspring 39. This arm 35 is moved to the left. by the energization ofrelay whose armature engages a lug on the arm. \Vhen in normal position.the plunger arm holds pawl 36 outof engagement with its ratchet and alug 38 carried on the plunger arm holds pawl 37 inoperative. The dashpot 3% is adjusted so as to release its arm very slowly. A bell cranklever 46. pivotally mounted on the frame. engages with one arm the bottom of the shaft (3 and with the other arm the contact arm of the sideswitch 31. \Vhcn the shaft 6 is returned to normal the lever 46 operatesto restore the side switch.

Contactv springs 0 are normally open and will be closed only when theprojection 11 forces rounded portion 12 against them. (ontact springs llwill close when the brush shaft 6 has taken two vertical steps and willremain closed thereafter until the switch is restored. I

I .\n impulse sender generally designated as 47 is provided with twosets of contact springs 1 and 52 which will be included in thecontrolling circuit otthc switch to be operated. This sender is providedwith dials l8 and 49 with each of which characters are associated. Thecharacters associated with the dial 48 may be numerals such as 1 to 0.and those associat d with the dial ltl may be letters. The dial 43operates independently ot' dial it) to open and close the springs 1. Thedial 4! is arranged to carry the dial 4% with it by means oi pin it whenoperated and thereby to operate the spring. 1 as though the dial 48 hadbeen used. In addition to opt rating the springs 1. and before suchoperation occurs. the lingcr ot' the operator when using the dial 49will engage a movable tingcr lcvcr at a sullicient period of time beforeengaging the stationary tingcr stop in order to cause a singlc openingol the springs 2 tor a period considerably longer than that of animpulse through the springs 1.

t'urrcnt is normally supplied to the calling subscribers substation frombattery through the windings of the retardation coil 42. but when theline -is in use the battery will be removed by the opening of otf-normalcontact ON of the line switch indicated diagrammatically at LS and willbe replaced by battery at relay 3.

Further details will be understood from the following description of theoperation of the switch.

hen the subscriber removes his receiver from the hook at line switch LSwill pick out an idle connector circuit. whereupon rclay 3 will beenergized from battery. through its winding. lower wiper of LS.switchhook SH, contact springs 1 and :2. left-hand winding of 42. toground. It the subscriber dc sires connection with a l to whoseterminals are in the bank A he wil operate his sender using the numeralcorresponding to the firstdigit of the number of the called line. andwill thus cause a series of impulses to be sent out by the intermittentbreaking of the previously described energizing circuit of the relay atthe contact. spring 1. When the relay 3 was. first. energized it closeda circuit for energizing the slow release relay 4 from battery. armatureand front contact of relay 3. winding of relay r, to ground.

The cnergization of the relay 4 caused the holding pawls to engage thevertical and rotary ratchets. Vlltll the subscrila'l dials. the armatureof the relay 3 vibrates. and each time the relay 3 is det ncrgized acircuit is closed from battery. armature and back contact of relay 3.armatui and frontcontact of relay r. contact arm of side switch 31(position 1). through the winding of the vertical magnet "M. to ground.This results in the elevation of the brush shaft (3 until brushes a areopposite the group of terminals in which the desired line terminatcs.

When the numerals on the dial are used. the first two impulses scntthrough the springs I raise the brushes 11" to thc tirst group of lineterminals. After the HtUlltl impulse the springs. -tl will he closed andthe slow release magnet 5 will be energized from battery, armature andback contact of the relay 3, springs 41. through the winding of themagnet 5. to ground. and will he hcl'l up through the remainder of theseries of impulses. 'hcn magnet 5 is energized rod 15 will push the rod16 to the right so that. the side switch will step into its secondposition upon the release of ll'c magnet which occurs at the cud of thclirst series of impulses.

The subscriber now dials again. sending out a second scrics of impulsesover the circuit previously traced as ta as the side switch which is.arm in position '3. o that impulses are transmitted thcncc o er the wirc[5 to the rotary umgnct HM. During this series of impulses thc lowmagnct 5 will again be energized and at the end of the impulses willmove the side switch 31 into its third, or idle position. Brushes a willnow rest on the terminals of the desired line and will be connected tothe calling substation through springs 27 and 28, insulated arms 25 and.26, wires 43 and H, and the wipers of the line switch LS.

If, however, a subscriber desires conncction with a line havingterminals in the bank B, he dials with the 'letters instead of thenumerals forthe first series of impulses. The contact springs 2 will beopened, causing the retraction of the armature of the relay 3, whichsends one impulse from battery, arn'iature and back contact of relay 3,armature and front contact of relay 4, side switch 31 (position 1)through the winding of the vertical magnet, to ground, to elevate shaft6 one step. Immediately after the sending of this impulse the armatureof the relay 1- will drop back, and an energizing circuit for magnet 5will be closed from battery, armature and back contact of. the relay 3,armature and back contact of the relay 4-, contact springs 40, which arenow closed since the shaft 6 has been elevated one step, rod 23, throughthe winding of the magnet 5 to ground.

The attraction of the armature of magnet 5 causes the rod 15 to engagelug 18, which it rests against, after the first vertical step of thebrush shaft, thus -ausing the movement of the plunger arm 19 to theright. Contact springs 2 will now close, causing the energization ofrelay 3 and relay 4. The armature of relay 4 was not retracted for asufficiently long time to allow plunger 35 to return to normal, whichwould have removed holding pawl 36 from the vertical ratchet and allowedthe brush shaft 6 to drop back to normal. When the closure of thecontact springs 2 resulted in the energization of the slow relay 4, thecircuit for holding up magnet 5 was broken at the back contact of relay4, and magnet 5 became deenergized. The plunger arm 19. however,

being held by the dash pot 20 did not have time to return to normalbefore the second step of the brush shaft caused the rod 9 to engageroller 21 and hold arm 19 in its right-hand position.

ln'n'nediately after the closure of the con tact springs 2 a series ofimpulses is sent out, which causes the armature of the relay 3 tovibrate, transmitting impulses over the circuit previously traced to thevertical magnet so that the brush shaft is lifted until the brushes 1)are opposite the group of terminals containing the desired line. At theconclusion of this series of impulses magnet .5 again becomes dcinergizcd. allowing the side switch to step into its second position. Thesubscriber now dials again with the result that the rotary magnet isintermittently energized until the brushes 6 rest on the terminals ofthe desired line, at which time the subscriber will be connected throughline switch LS, wires t3 and 44, insulated arms 25 and 26, now in theirright-hand position, springs 29 and 30, to the brushes 1).

At the end of the conversation, when the subscriber hangs up hisreceiver, he breaks at his switchhook SH the holding circuit of: relay3, which retracts its armature. The consequent deenergization of therelay 4 is followed by the return of the plunger arm 35 to normal, whichdisengages the holding pawls 36 and 37 from their respective ratchctsand allows the brush shaft 6 to be rotated back ,to normal by the usualspring (not shown), and to fall into a normal position under theinfluence of gravity. "When it reaches bottom, the end of shaft (3,pressing on one arm of the bell crank lever 46, will cause therestoration of the side switch 31, and the apparatus is ready for thenext call.

hat is claimed is:

1. In a telephone system, telephone lines, selective switches arrangedto interconnect said lines, said switches being provided with aplurality of banks of fixed terminals and a set of brushes to travelover and make contact simultaneously with the terminals of each of saidbanks respectively, an impulse transmitter, means for connecting saidimpulse t ansmitter to any one of said switches, and means at eachswitch controlled by the first impulse transmitted thereto from saidimpulse transmitter for determining the particular set of brushes atsaid switch to be used.

In a telephone system, telephone lines, selective switches arrangedtointerconnect said lines, said switches being provided with a pluralityof banks of fixed terminals and a set of brushes to travel over and makecontact with the terminals of each of said banks respectively, animpulse transmitter, means for connecting said impulse transmitter toany one of said switches, and means at each switch controlled by thecharacter of the first impulse transmitted thereto from said impulsetransmitter for determining which of said sets of brushes at said switchshall be used,

In a telephone system, an incoming line, a plurality of outgoing lines,an automatic switch arranged to select any one of said outgoing lines,means for connecting said incoming line to said switch, said switchbeing provided with a plurality of sets of brushes arranged to engagesimultaneously contacts of said switch, an impulse transmitterassociated with said incoming line and arranged to directively controlsaid switch, and means directively controlled by first impulsetransmitted from said impulse transmitter when associated with saidswitch for determining which of said sets of brushes shall be used.

4. In a telephone system, telephone lines, selective switches arrangedto interconnect said lines an impulse transmitter, said switches beingprovided with a plurality of banks of fixed terminals and a set ofbrushes to tavel over and make contact with each of said banks ofterminals,- respectively, said impulse transmitter being arranged tooperate from a plurality of sets of positions to send the same train ofimpulses from corresponding positions in each set of positions, acircuit changing device included in said impulse transmitter arranged tobe differently actuated in each of said sets of positions, and meanscontrolled by 'said circuit changing device for causing one or anotherof said sets of brushes to be used.

In a telephone system, telephone lines,

selective switches arranged to interconnect said lines, an impulsetransmitter, said switches being provided with two banks of fixedterminals and two sets of brushes arranged to travel over and makecontact with the terminals of each of said banks, respectively, saidimpulse transmitter being arranged to be actuated from two sets ofpositions to send the same train of impulses from correspondingpositions in each set of positions, a circuit changing device includedin said impulse transmitter arranged to be actuated in one of said setsof positions only, and means controlled by said circuit changing devicefor causing one or the other of said sets of brushes to be used.

In witness whereof, I hereunto subscribe my name this 29th day ofNovember, A. -D.

' FRANK A. LUNDQUI ST.

